Abstract
Background: Bubbly flows can frequently be seen in engineering fields such as fermentation reactions, floatation of minerals, drag reduction by bubbles, etc. The physical parameters often change in industrial processes, so it is important to conduct extensive studies on the influence of gas- and liquid- phase parameters on the liquid turbulence.
Objective: The extensive studies are performed on the liquid turbulence modulation by bubble injection with change of bubble velocity, gravity magnitude and considering bubble coalescence, and some physical laws on liquid turbulence flow laden with bubbles are applied to guide the design of patents on the drag reduction system by bubbles.
Methods: The bubbly turbulent flows are investigated with the numerical method, the mixture model is chosen as the multiphase flow model, and the velocity field of the turbulent flow is solved by Reynolds stress model.
Results: The present results show that the bubble velocity has the very little influence on the liquidphase turbulence; the gravity magnitude has the definite influence on the liquid-phase turbulence, and the influence of the bubble injection on the liquid-phase turbulence under normal gravity is far greater than that under microgravity. In addition, only when the bubble volume fraction is sufficiently high, the bubble coalescence has the significant influence on the liquid-phase turbulence.
Conclusion: The influence of gravity on the bubble distribution and the liquid-phase turbulence is important, and the bubble coalescence causes the definite influence on the liquid turbulence modulation when the bubble volume fraction is high enough.
Keywords: Bubbly flow, liquid turbulence modulation, gravity, bubble coalescence, mixture model, bubble velocity.
Graphical Abstract
Call for Papers in Thematic Issues
Advanced Experimental, Computational Fluid Dynamics and Intelligent Computing Techniques on Complex Multiphase Flow Problems
Computational fluid dynamics (CFD) and Intelligent computing are very emerging technology in various industrial applications. Multiphase flow problems are very dominant in hydro as well as power plants, mining, marine, cementing, food processing, and ore-processing industries. Multiphase flows include gas-solid as well as liquid-solid flows. The solid like ores, ash, ...read more
Advanced materials for energy production, transmission, and utilization
Hydrogen storage and production materials: Developing high-performance hydrogen generation and storage materials, as well as researching the mechanism of hydrogen-material interaction. The emphasis for supercapacitors is on carbon-based materials derived from various biomass carbonization methods, as well as carbon-containing electrode materials such as metal sulfide, oxides, and other similar compounds. ...read more
Advancements in Machine Learning for Medical Applications in Material Science
The fusion of machine learning with medical applications and material science has ushered in a new era of innovation, offering transformative solutions to complex healthcare challenges. "Advancements in Machine Learning for Medical Applications in Material Science," a special issue, serves as a crucible for exploring the remarkable synergy between these ...read more
Computational Methods in Engineering
In recent decades, computational methods have revolutionized the field of engineering, playing a pivotal role in enhancing efficiency, accuracy, and innovation across various disciplines. This proposed thematic issue aims to explore and showcase the latest advancements, challenges, and applications of computational methods in engineering. As technology continues to evolve, computational ...read more
Related Books
Intelligent Technologies for Automated Electronic Systems
Modern Radio Signals Filtering Devices Methods, Technologies, & Structures
Functional Bio-based Materials for Regenerative Medicine: From Bench to Bedside (Part 2)
Mechanical Engineering Technologies and Applications
Multistage Interconnection Network Design for Engineers
Mechanical Engineering Technologies and Applications
Semi-rotary and Linear Actuators for Compressed Air Energy Storage and Energy Efficient Pneumatic Applications
Waste Valorization for Value-added Products
One-Dimensional Transient Flow in Pipelines Modelling and Simulation
Principles of Automation and Control
22